FAQ

You can either submit your request for quotation online or you can contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative.

“The lead time strongly depends on the type of product(s). Indicative lead times are:
* Glass bottles, caps and septa: 1 to 2 weeks
* PP/PE bottles: 6 to 8 weeks
* Basic range of spare parts: 3 to 4 weeks
* Pre-configured sampling systems: an average of 6 weeks
* Other products: on request”

You can find a list of the information we need to process your request for quotation, on the inquiry page.

To get a drawing of a specific sampling system, you can contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative.

Dovianus is certified to conduct dye penetrant inspections and PMI testing. X-ray examination is subcontracted.

Each sampler undergoes functional tests and a hydrostatic pressure test at 1.5 times the design pressure.

“Yes, this is possible. For this you need to replace the sleeve of your sampler to match the dimensions of the bottle. Please note that some systems require additional modifications.

If you are still not sure whether you can use the bottle you have: feel free to contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative. Please make sure that you notify the contact person whether it concerns your own bottle or a Dopak bottle.”

Yes, that’s possible. You can find our range of needle assemblies on the spare parts page. Please also refer to our needle exchange program.

Yes, that’s possible. You can find our range of bottles, septa and caps on the consumables page.

Yes, we do. Please contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or our local representative in your country, to discuss the possibilities.

“In general our advice is to use a glass bottle for all samples with a vapor pressure up to a maximum of 0.7 bar. A cylinder can resist higher pressures than that.

In some cases the sampling product has a vapor pressure below 0.7 bar, but ‘lighter components’ can easily escape through the vent. In that case it is advisable to use a cylinder.

You can either submit your request for quotation online or contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you need further advice on sampling in a bottle or a cylinder.”

“All Dopak sampling systems will be supplied in compliance with Pressure Equipment Directive (PED) No. 97/23/EC. This does not automatically mean that the samplers will be CE marked.

The PED divides pressure equipment in different categories based on pressure, volume and whether the product is a dangerous gas or liquid, or not.

Almost every Dopak sampling system falls under paragraph 3.3 of the PED. This paragraph describes the Sound Engineering Practice (SEP). The SEP indicates that the equipment shall be designed and manufactured in accordance with the sound engineering practice of a Member State in order to ensure safe use. Paragraph 3.3 of the Pressure Equipment Directive also indicates that such equipment shall not bear the CE marking.

In the exceptional case a Dopak sampling system falls under a category other than Sound Engineering Practice, the applicable requirements of that category will be followed, including the required Notified Body involvement. Such equipment will bear the CE marking.”

Yes, that’s possible. You can find our range of spare parts for sampling systems on the spare parts page.

Yes, this is possible. Please refer to the repair procedure on the service procedures page.

Dovianus does not carry any stock for sampling systems. Each sampler is designed and built, matching the requirements of the client. Pre-configured sampling systems are built according to standard specifications and have a shorter lead time.

Please submit your request for quotation via the inquiry form.

The repair time depends on the complexity of the repair and what parts need to be replaced. Please refer to the repair procedure for more information.

The brands of components that Dovianus normally uses for the Dopak samplers include: Hoke, Swagelok and Parker. However, we can use any brand of your preference.

“In your delivery, you will find a USB flash drive with standard documentation such as:
* Operation manual
* ATEX certificates
* Data sheets
* Brochures

On request and at additional cost, we can also send you the following documentation in PDF format:
* GA drawing
* Test certificates
* Material certificates
* Et cetera

Do not hesitate to contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you would like more information on the documentation you receive.”

Some Dopak sampling systems are equipped with a valve that has an end screw or a stem seal. If the valve leaks after first use, it is possible that the end screw or the stem seal needs to be tightened. Tightening or adjusting the end screw or stem seal will solve the leakage problem.

If you need more information on how to tighten the end screw or stem seal, please contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative.

The Dopak sampling systems are ready to be installed. You will arrange for the installation and initial operation yourself.

In the Netherlands you can collect your order by appointment. Please contact Dovianus in Bergschenhoek to make an appointment.

The transportation and delivery charges strongly depend on factors such as delivery address, size, weight and other conditions.

Please contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative for more information on the transportation and delivery charges.

Dovianus’ standard delivery terms are FCA. Other terms of delivery can be discussed.

Please refer to the Incoterms or contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you want more information on the terms of delivery.

The contact details for Dovianus in the Netherlands, Dopak DFT Corp. in the USA or for one of our local representatives, can be found on the contact page.

Dovianus is the name of our company in the Netherlands, Dopak PFT Corp. is the name of our company in the USA and Dopak the brand name of our products.

You can find our bank details on the contact page.

You can find our VAT number on the contact page.

You can find our Chamber of Commerce number on the contact page.

Please contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative to request a copy of any operation manual. Please clearly state your order number.

You can find a copy of our ISO 9000:2008 certification on this page.

This depends on the sampling system you have or need. When you have found the correct sampler, animations and data sheets are available for the product. Here you will be able to review product information and how to operate the specific sampler.

You can either submit your request for quotation online or contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you need further advice.

In your delivery, you will find a USB flash drive with standard documentation such as:
* Operation manual
* ATEX certificates
* Data sheets
* Brochures

On request and at additional cost, we can also send you the following documentation in PDF format:
* GA drawing
* Test certificates
* Material certificates
* Et cetera

Do not hesitate to contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you would like more information on the documentation you receive.

To get a drawing of a specific sampling system, you can contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative.

Dovianus is certified to conduct dye penetrant inspections and PMI testing. X-ray examination is subcontracted.

Each sampler undergoes functional tests and a hydrostatic pressure tests at 1.5 times the design pressure.

The pressure on the vent (back pressure) may be up to 0.7 bar when sampling with a glass bottle.

In general our advice is to use a glass or plastic bottle for all samples with a vapor pressure up to a maximum of 0.7 bar. A cylinder can resist higher pressures than that.

In some cases the product has a vapor pressure below 0.7 bar, but ‘lighter components’ can easily escape through the vent. In that case it is advisable to use a cylinder.

Do not hesitate to contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you need further advice on sampling in a bottle.

The filling rate of a sample bottle depends amongst other things, on the operating pressure. At a higher pressure the filling rate is too high to guarantee safe sampling. There is the possibility to overfill the sample bottle. Therefore Dovianus sets the limit of 8 bar for the operating pressure.

With a fixed volume sampler, such as the Dopak sampling system type S23, the sample is taken independently of the operating pressure. The filling rate is therefore not influenced by the operating pressure. In addition, the volume of the sample chamber adapts to the volume of the sample bottle, reducing the chance of overfilling the sample bottle to an absolute minimum.

The filling rate of a sample bottle depends amongst other things, on the operating pressure. At a higher pressure the filling rate is too high to guarantee safe sampling. There is the possibility to overfill the sample bottle. Therefore Dovianus sets the limit of 8 bar for the operating pressure.

With a fixed volume sampler, such as the Dopak sampling system type S23, the sample is taken independently of the operating pressure. The filling rate is therefore not influenced by the operating pressure. In addition, the volume of the sample chamber adapts to the volume of the sample bottle, reducing the chance of overfilling the sample bottle to an absolute minimum.

“An outage tube, expansion chamber and additional safety cylinder are different methods of reaching the same result: to prevent the sample cylinder to be filled 100% with the liquid or liquefied gas.

Liquids and liquefied gases are not compressible. If a completely filled sample cylinder warms up (either by the sun or when it is being transferred from a cold, outside temperature to a warm, indoor temperature), the liquid or liquefied gas will expand. This causes the pressure in the cylinder to increase rapidly, possibly to unacceptable levels.
Outage tube
An outage tube is a tube that is mounted into the cylinder. It creates a safe and compressible ‘gas bubble’ in the cylinder to regulate the pressure (internal outage).
Expansion chamber
When using an expansion chamber, the sample cylinder is initially filled 100%. Subsequently a connection is made between the cylinder and the expansion chamber. This way, part of the liquid or liquefied gas will run into the expansion chamber, creating a safe and compressible ‘gas bubble’ in the cylinder.
Additional safety cylinder
With the third method, the sample cylinder is connected to a pressure relief valve and an (small) extra cylinder (the so-called ‘piggyback’). In this case the cylinder remains completely filled. When the pressure in the cylinder increases to an unacceptable level, the overpressure valve will open and a connection is being established to the extra cylinder. This extra cylinder is filled with (compressible) air, keeping the pressure to acceptable levels.”

The standard material used for Dopak sampling systems is SS316 stainless steel. The wetted parts however, can be manufactured in a diversity of exotic material such as Hastelloy, (Super) Duplex, Monel, Inconel, Titanium or 6Mo.

Do not hesitate to contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you have further questions on the material used for our sampling systems.

Yes, it is possible to build a sampling system according to your P&ID/layout.

Do not hesitate to contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you would like more information on custom-made sampling systems.

All Dopak sampling systems will be supplied in compliance with Pressure Equipment Directive (PED) No. 97/23/EC. This does not automatically mean that the samplers will be CE marked.

The PED divides pressure equipment in different categories based on pressure, volume and whether the product is a dangerous gas or liquid, or not.

Almost every Dopak sampling system falls under paragraph 3.3 of the PED. This paragraph describes the Sound Engineering Practice (SEP). The SEP indicates that the equipment shall be designed and manufactured in accordance with the sound engineering practice of a Member State in order to ensure safe use. Paragraph 3.3 of the Pressure Equipment Directive also indicates that such equipment shall not bear the CE marking.

In the exceptional case a Dopak sampling system falls under a category other than Sound Engineering Practice, the applicable requirements of that category will be followed, including the required Notified Body involvement. Such equipment will bear the CE marking.

Yes, that’s possible. You can find our of spare parts for sampling systems on the spare parts page.

The brands that Dovianus normally uses for the Dopak samplers include: Hoke, Swagelok and Parker. However, we can use any brand of your preference.

You can safely empty a bottle with the ‘Sample Recovery System‘. You can safely empty a cylinder with the ‘Cylinder Emptying System‘.

You can submit your request via the quotation page.

There could be a number of reasons why a septum doesn’t seal properly:

1. The septum has been used before.
We strongly advise you to use a new septum for each sampling. Check the septum carefully and change the septum if necessary.
2. An incompatible combination of process needle and septum material is used.
Some needle diameters are too big for certain septum materials. Determine what septum material you want to use and what the diameter is of the process needle of your sampling system. Check whether this is the right combination.

Please contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you would like more information on the compatibility of septum material and process needle.

Some Dopak sampling systems are equipped with a valve that has an end screw or a stem seal. If the valve leaks after first use, it is possible that the end screw or the stem seal needs to be tightened. Tightening or adjusting the end screw or stem seal will solve the leakage problem.

If you need more information on how to tighten the end screw or stem seal, please contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative.

In general our advice is to use a glass bottle for all samples with a vapor pressure up to a maximum of 0.7 bar. A cylinder can resist higher pressures than that.

In some cases the sampling product has a vapor pressure below 0.7 bar, but ‘lighter components’ can easily escape through the vent. In that case it is advisable to use a cylinder.

You can either submit your request for quotation online or contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you need further advice on sampling in a bottle or a cylinder.

Yes, this is possible. For this you need to adjust the sleeve of your sampler to match the dimensions of the bottle. Please note that some systems require additional modifications.

If you are still not sure whether you can use the bottle you have: feel free to contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative. Please make sure that you notify the contact person whether it concerns your own bottle or a Dopak bottle.

Yes, that’s possible. You can find our range of needle assemblies on the spare parts page. Please also refer to our needle exchange program.

You can change damaged needles via our needle exchange program.

A septum is only used once. You need to change the septum for each new sampling. This is the only way to guarantee an emission free sample and the safety of your operator and the environment.

Yes, this is possible. Please refer to the repair procedure on the service procedures page.

Most likely the viscosity of the product is too high for the needle assembly. It could also be possible that the needle assembly is blocked or that the operating pressure is too low. Use a different needle assembly to increase the filling rate. Order a different needle assembly via our needle exchange program.

Contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you need advice on what needle assembly or bottle to use. You can also contact us when the needle assembly is blocked or when the operating pressure is too low.

Either the bottle is too small, the process needle of the needle assembly is too big or the operating pressure is above 8 bar. Use a different bottle or needle assembly to decrease the filling rate. Order a different needle assembly via our needle exchange program.

Contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative in case you need advice on what needle assembly or bottle to use. You can also contact us in case the operating pressure is above 8 bar.

To get a drawing of a specific sampling system, you can contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative.

Yes, that’s possible. You can find our range of needle assemblies on the spare parts page. Please also refer to our needle exchange program.

Please contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative to request a copy of any operation manual. Please clearly state your order number.

Some Dopak sampling systems are equipped with a valve that has an end screw or a stem seal. If the valve leaks after first use, it is possible that the end screw or the stem seal needs to be tightened. Tightening or adjusting the end screw or stem seal will solve the leakage problem.

If you need more information on how to tighten the end screw or stem seal, please contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or your local representative.

Yes, we do. Please contact Dovianus in the Netherlands, Dopak PFT Corp. in the USA or our local representative in your country, to discuss the possibilities.

The Dopak sampling systems are ready to be installed. You will arrange for the installation and initial operation yourself.

Yes, that’s possible. You can find our range of spare parts for sampling systems on the spare parts page.

Yes, this is possible. Please refer to the repair procedure on the service procedures page.